> Sorry, I'd include a screen shot but I'm away from the computer. When you clicked the button to open a previous .mat file (I.e your conn_*.mat file) a window appeared. At the bottom of that window it indicates the kind of files can be chosen (it's a pull down menu) . Click "conn_*.mat" and choose "All files" . Although your .mat file will appear light in color you can still double click it. Hope that helps, I could have it wrong since I'm kinda going by memory and not testing this as I write. Lemme know if it doesn't work :) michaeltcking@me.com